13066981 has 4 divisors (see below), whose sum is σ = 13182732. Its totient is φ = 12951232.

The previous prime is 13066951. The next prime is 13066997. The reversal of 13066981 is 18966031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4120900 + 8946081 = 2030^2 + 2991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13066981 is a prime.

It is a super-2 number, since 2×13066981² = 341491984908722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13066901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57706 + ... + 57931.

It is an arithmetic number, because the mean of its divisors is an integer number (3295683).

Almost surely, 2^13066981 is an apocalyptic number.

It is an amenable number.

13066981 is a deficient number, since it is larger than the sum of its proper divisors (115751).

13066981 is a wasteful number, since it uses less digits than its factorization.

13066981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115750.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13066981 is about 3614.8279350475. The cubic root of 13066981 is about 235.5366098725.

The spelling of 13066981 in words is "thirteen million, sixty-six thousand, nine hundred eighty-one".